Method of driving paibs of reciprocating saws



G. P. KETGHAM, OF BEDFORD, INDIANA.

METHOD OF DRIVING PAIRS OF RECIPROCATING SAWS.

Specification of Letters Patent No. 12,412, dated February 20, v1855.

`T all whom t may concern Be it known that I, G. P. KETCHAM, of

` Bedford, in the county of Lawrence and St-ate of Indiana, haveinvented a new and Improved Mode of Driving Reciprocating Saws or otherParts of Machinery Having a yReciprocating Motion; and I do herebydeclare that the following is a full, clear, and exact description ofthe same, reference being had to the annexed drawings, making a part ofthis specification, in which- Figure 1, is a front view of tworeciproeating saws operated by my improved mode the frame and inclinedWheel or cam being bisected through 'their centers. Fig. 2, is atransverse vertical section of ditto.

Similar letters of reference indicate corresponding parts in the twofigures.

This invention relates to a new and improved mode of drivingreciprocating saws and other portions of machinery in which two partshave an opposite reciprocating motion working simultaneously in oppositedirections.

The nature of the invention consists in giving a vibratory motion to alever by means of 'an inclined wheel or cam as will be hereafter fullyexplained, the saws' or other parts to be operated being connected tothe ends of the lever above mentioned.

To enable others skilled inv the art 'to make and use my invention, Iwill proceed to describe its construction and operation.

A Figs. 1 and 2 represents a frame to the upper part of which areattached four vertical guides (a) (a) (a) (a) between which two sawsashes B, B, are placed, see Fig. 1. C represents a driving shaft at thelower I part of the frame A having upon it an inclined wheel or cam D.This cam or wheel is made perfectly true or round and of equal width orbreadth throughout, and is placed in an inclined or oblique position onthe shaft C, as clearly shown in Fig. l.

Directly over the cam or wheel D there is placed a lever E, through thecenter of which a shaft F passes, said shaft having its bearing in thefront and back of the frame A as shown in Fig. 2. The lever E ispermanently attached to the shaft F and works or moves with it.

To the under side of the lever there are attached two pendants orprojections (o) (o) at equal distances each side of the center of thelever E or the shaft F, see Fig. 1, andthe edge of the wheel or cam Dworks between the pendants or projections, (o)v (o) which have frictionrollers (c) (c) on their inner sides, one to each, see Fig. l.

Gr, Gr, are connecting rods lor pitmen which are secured by pivots (d)to the lower ends of the saw sashes B, and the ends of the vlever E.

As the driving shaft C is turned the edges of the wheel or cam D, will,owing to' its' inclination or Obliquity, act kalternately against thefriction rollers (o) (c) on the inner sides of the pendants orkprojections (o), (b), and give a vibratory motion to the lever E, and asthe saw sashes B are connected to the ends of the lever E by the rodsorpitmen Gr, the sashes will worlr simultaneously with an oppositereciprocating motion, orv one ascends while the other descends and thesashes are balanced, the descending sash by its gravity assisting theascending sash. The inclination or Obliquity of the wheel or cam Dshould be such as to give the desired length of stroke to the sashes B.

The above improvement may kbe applied to any parts of machinery havingthe saine motion as the saw sashes, as herein shown. It possesses manyadvantages over the usual crank motion, there is less friction, thepower is applied vertically or nearly so to the sashes, and one sashbalances the other causing the motion to be regular or even.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent, is,

Operating the saw sashes B, B, by means of the inclined wheel or cam Dand lever E with its pendants or projections (b), (b) the parts to beoperated being connected to the ends of` the lever E by rods\or pit-menG. The above parts being constructed and arranged substantially asherein shown.

GEO. P. KETCHAM.

Witnesses:

ISAAC DENsoN, P. T. VIs'rAL.

